Kolb began last season as the heir apparent to Donovan McNabb in Philadelphia, but he went down with a concussion in the opener, losing his job to Michael Vick in the process. The Cardinals, meanwhile, have been looking for an answer at quarterback since Kurt Warner retired following the 2009 season.

"Ultimately, Kevin was the guy that we had the highest grade on, that we felt was the best fit for what we're trying to get accomplished as far as a fit with our offense, where he was age-wise, what he had done in the league," Cardinals coach Ken Whisenhunt said. "That was our target."

The deal was highly anticipated for several months during the NFL lockout. It finally became official Thursday afternoon.

"I know he'll do a great job, and I'm pulling for him," Eagles coach Andy Reid said of Kolb. "I think he deserves this opportunity. I'm very happy for him. His hard work is rewarded."

As part of the trade, the Cardinals will give Kolb a five-year contract worth a maximum of $63.5 millon and including $21 million guaranteed, a league source told NFL Network insider Jason La Canfora.

Kolb took to his Twitter account following the trade.

"Excited to be a Cardinal!" he wrote. "Thanks to all the fans, friends, coaches and teammates I got to know in Philly, y'all will be missed."

Rodgers-Cromartie, who went to the Pro Bowl in 2009, will play opposite four-time Pro Bowl cornerback Asante Samuel for the Eagles, who struggled against the pass last season, allowing a franchise-record 31 touchdowns in the air.

"He's a Pro Bowl-caliber player, he's explosive, he's got great ball skills, he'll fit well with the kind of philosophy we're running on defense," Eagles general manager Howie Roseman said of Rodgers-Cromartie, who hasn't played right corner before. "He's also got great height, so he's able to match up with bigger receivers, rare speed. An explosive guy. Knows how to break on the ball. Can press. Can play off. Can play all sorts of coverages, and in our defense, we want him to do those sorts of things.

Fabiano: Good news for Fitzgerald

The biggest beneficiary
of the Kevin Kolb deal is Larry Fitzgerald, who won't have Derek Anderson, Max Hall or John Skelton throwing to him anymore,
Michael Fabiano writes.
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"And then I think being with Asante will help him. Asante's got great ball skills. He knows how to study quarterbacks. I think being around here in this defense and the way we're going to get up field with our pass rush, I think he'll have great opportunities to make plays."

Kolb, a second-round draft pick out of the University of Houston in 2007, started just seven games in four seasons with the Eagles. He became the first quarterback in NFL history to throw for 300 yards in his first two starts when he filled in for an injured McNabb in Weeks 2 and 3 in 2009. The Eagles traded McNabb to the Washington Redskins in April 2010, paving the way for Kolb to become the starter.

But Kolb was injured during the first half of the opener against the Green Bay Packers and Vick played so well that he remained the starter. Kolb completed 61 percent of his passes for 2,082 yards and 11 touchdowns with 14 interceptions. He was outstanding filling in for an injured Vick last October, completing 23 of 29 passes for 326 yards and three touchdowns with one interception in a victory over the Atlanta Falcons.

"Historically, there have been trades made with players at that position who have not had a great deal of playing time leading up to that," Cardinals GM Rod Graves said. "If you believe in the player and you feel like he's a good fit for your organization, you go after it, and that's what we did. We saw a quarterback there that we felt very excited about, we feel like he can come in and get the job done for us, and put us in a position to be a championship-caliber football team. What's the price for that? To be able to get in that position, let's just say we did what we felt like we had to do to make that happen."

The NFL free agency cycle is in full effect, with teams and players agreeing to terms fast as training camps open. Get the latest on all the news right here.

When Warner retired after leading the Cardinals to a Super Bowl and consecutive NFC West titles, the team wound up with erratic Derek Anderson at quarterback. Eventually, he was benched in favor of undrafted rookie Max Hall, who after some disastrous play was replaced by another rookie, fifth-round draft pick John Skelton. Anderson was released after the Kolb trade.

Besides needing far better play at quarterback, Arizona needed to show wide receiver Larry Fitzgerald it was serious about bringing in someone who could get him the ball. Fitzgerald is in the last year of his contract, and re-signing with the Cardinals could hinge on how the team improves offensively this season.

Kolb already has lost potentially one of his best receivers in free agent Steve Breaston, who isn't re-signing with Arizona and is headed for the Kansas City Chiefs.

"He's going to give them an opportunity to win, each and every Sunday, and I think that's what's important," Vick said of Kolb. "So they can be happy about that."

A first round draft pick (16th overall) of Arizona in 2008, Rodgers-Cromartie has recorded 16 interceptions (13 regular season, three playoffs) in 54 career games (49 starts) since entering the league. That total ranks him fourth among all NFL cornerbacks during that span behind Samuel (22) and Green Bay's Tramon Williams (18) and Charles Woodson (18). In addition, Rodgers-Cromartie's four interception returns for touchdowns since 2008 are tied for second behind Woodson (6).